The Danish State Archives
Information about the Danish State Archives and genealogy in Denmark. Links to online databases of church books, censuses etc.
The most comprehensive collection of links to genealogy sites form all over the world. The links are categorized which makes everything easy to find.
Software for genealogy. It is not free, but due to its user-friendly and flexible interface, the money is well spent.
Family Tree PHP
Script to create an online genealogy database. It generates a MySQL database based on a gedcom file. I use it myself, not for the design, but simply to create the datase. It is priceless.